低渗透薄互层压裂技术研究及应用
Research and Application of Low Permeability and Thin Interbed Fracturing Technology
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- 引用格式:
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尹,建,郭建春,曾凡辉.低渗透薄互层压裂技术研究及应用[J].天然气与石油,2012,30(6):0.doi:
.Research and Application of Low Permeability and Thin Interbed Fracturing Technology[J].Natural Gas and Oil,2012,30(6):0.doi:
- DOI:
- 作者:
- 尹 建 郭建春 曾凡辉
- 作者单位:
- 西南石油大学“油气藏地质及开发工程”国家重点实验室
- 关键词:
- 低渗透；薄互层；压裂改造；定点射孔；高导流能力；现场应用
Low permeability； Thin interbed reservoir； Fracturing transformation； Point perforation； High conductivity； Field application
- 摘要:
- 低渗透薄互层具有储层物性差、有效厚度薄、天然裂缝发育等特点，压裂改造是这类储层投产或增产的重要手段。但常规集中射孔、大排量压裂改造易导致裂缝窜层严重，小排量施工可能导致部分层段无法压开，不能保证增产改造效果。因此有必要研究适合低渗透薄互层的压裂技术。在分析低渗透薄互层压裂改造难点基础上提出采用定点射孔、压裂技术实现薄互层充分改造，同时采用高砂比和组合粒径支撑剂保持裂缝的长期高导流能力，并结合控制缝高和降低滤失工艺形成薄互层高效压裂改造的综合技术。该综合技术已在LW井成功应用，改造后产油14.3 t/d，与采用常规压裂工艺的邻井产油6.7 t/d相比，增产效果显著。
Low permeability thin interbedded reservoir has such characteristics as poor reservoir property， thin effective thickness and developed natural fractures and fracturing reconstruction is an important means for putting into production and production increase of such reservoir. However， conventional centralized perforation and large displacement fracturing modification may easily result in serious fracture interzone and small displacement construction may result in undesirable effects. Therefore， it is necessary to study fracturing technologies suitable for low permeability thin interbedding reservoir. After analyzing difficulties in low permeability thin interbedded reservoir fracturing reconstruction， the point perforation fracturing technology is selected for such fracturing reconstruction. At the same time， used are high sand ratios and combined grain size proppant to hold long-term high conductivity ability of fractures and combined are control of fracture height growth and fluid loss process to form a comprehensive technology for efficient thin interbed fracturing reconstruction. This comprehensive technology has been successfully applied in LW well and oil output of 14.3t/d after transformation is much more than 6.7t/d of the adjacent well in which conventional fracturing process was applied， which shows that the comprehensive technology has remarkable production increase effect.
